\begin{Schunk}
\begin{Sinput}
> oo.res <- oo$proto(pch = "-", x = oo$residuals()$y, ylab = "Residuals deg K")
> par(mfrow = c(1, 1))
> oo.res$smooth()
> oo.res$plot()
\end{Sinput}
\end{Schunk}
